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[SCIENCE AND MEDICINE] - SCARCE EARLY ARITHMETIC MANUAL — IN ORIGINAL BINDING WITH MANUSCRIPT WASTE - FIBONACCI Leonardo (1170 - 1242) - [MATHEMATICS – ABBACO TRADITION] — Libro de Abacho. [Venice Francesco bindoni, 1528] 4to (approx. 225 x 159 mm); contemporary binding using medieval manuscript on parchment with red and blue initials and rubrication visible; substantial wear but structurally intact. Title-page with verse introduction and printer’s device. 100 ff. Ink ownership inscription at foot of title. Internally clean with expected wear; title leaf with slight edge loss, no loss of text Extremely rare early 16th-century printed manual in the Italian abbaco tradition — the practical arithmetic treatises designed for merchants and traders. This Libro de Abacho is part of a tradition stemming from Fibonacci’s Liber Abaci (1202), adapted in the vernacular for practical use. Such works were widely used by merchants and shopkeepers, apprentices in merchant schools, accountants and notaries Early abbaco books are extremely rare on the market